Cosmetic Composition Stabilization via Particle Size and Viscosity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cosmetic compositions using iron oxide particles for liquid eyeliners face issues with precipitation and color separation due to the high specific gravity and large particle diameter of red iron oxide, leading to inconsistent performance when the pen type structure is changed.
Innovation Solution
A cosmetic composition is developed containing an anionic polymer dispersant, an acid with a molecular weight of 300 or less, and iron oxide particles, with controlled viscosity and particle diameter, to enhance dispersibility and stability, specifically using poly-sodium aspartate and organic acids like citric acid, ensuring the particles remain suspended and prevent color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If red iron oxide particles are used as a coloring material for liquid cosmetics, then the safety and coloring performance are improved, but the high specific gravity and large particle diameter cause precipitation and color separation
Solution Approach 1:
The patent applies parameter changes by controlling the average particle diameter of iron oxide particles to 100 nm or less and adjusting the viscosity of the cosmetic composition to 15 mPa·s or less. These parameter modifications resolve the contradiction by enabling the use of iron oxide particles for safe and effective coloring while preventing precipitation and color separation through optimized particle size and viscosity control
Solution Approach 2:
The patent introduces an anionic polymer dispersant as an intermediary substance to mediate between the iron oxide particles and the cosmetic formulation. This dispersant acts as a bridging agent that prevents aggregation and settling of the fine iron oxide particles, thereby maintaining dispersibility and aging stability while allowing the use of safe coloring materials
2Stability of the object's composition
If the viscosity of the cosmetic composition is increased to prevent settling, then the dispersibility is improved, but the application performance and fluidity deteriorate
Solution Approach 1:
The patent optimizes the viscosity parameter to 15 mPa·s or less, finding the optimal balance point where the composition maintains sufficient stability to prevent settling while preserving adequate fluidity for easy application. This precise parameter control resolves the contradiction between stability and ease of operation
3Stability of the object's composition
If the particle diameter of iron oxide is reduced to improve dispersibility, then the dispersibility is improved, but the coloring intensity and coverage may be affected
Solution Approach 1:
The patent controls the average particle diameter to 100 nm or less while maintaining effective coloring intensity through optimized particle size distribution and concentration. This parameter optimization ensures that the fine particles provide excellent dispersibility without compromising the coloring performance required for eyeliner applications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition maintains excellent dispersibility and aging stability, preventing precipitation and color separation, even when stored for long periods, ensuring consistent performance and color consistency in liquid cosmetic applicators.
Implementation Method 1
containing a specific polymer dispersant... an anionic polymer dispersant
Implementation Method 2
an acid having a molecular weight of 300 or less and iron oxide particles
Implementation Method 3
a viscosity thereof is controlled to a specific value or lower, and an average particle diameter of the iron oxide particles in the cosmetic is controlled to a specific value or lower
Data Source
AI summary
The cosmetic composition of the present invention is characterized by containing an anionic polymer dispersant, an acid having a molecular weight of 300 or less and iron oxide particles, wherein a viscosity of the cosmetic is 15 mPa·s or less, and an average particle diameter of the iron oxide particles in the cosmetic is 100 nm or less. The above cosmetic composition is excellent in an aging stability and can be used by charging in a liquid cosmetic applicator.